The expression of VEGF, GFAP, and BDNF genes in the nervous tissue changed on weeks 4, 8, and 12 after fractionated irradiation of the brain according to different protocols in a fixed total dose of 36 Gy. The expression of VEGF gene decreased in the prefrontal cortex and hippocampus after 4 and 8 weeks. After week 12, the expression of VEGF normalized in the prefrontal cortex and remained low in the hippocampus.
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